10
System Configuration Section 1-2
System Combining a Safety Control System and a PLC Monitoring Control System
This system uses the NE1A-series Controller as a Safety Master and estab-
lishes a Safety Remote I/O System with Safety Slaves.
The NE1A-series Controller is used as a Standard Slave and standard I/O
communications are performed with the Standard Master. The NE1A-series
Controller simultaneously functions as the Safety Master and a Standard
Slave.
As a Standard Slave, the NE1A-series Controller enables standard I/O com-
munications for a maximum of two connections with up to 16 bytes per con-
nection. Four protocols (i.e., Poll, Bitstrobe, COS and Cyclic) are supported
for I/O connections. The NE1A-series Controller cannot operate as a Stan-
dard Master.
The Safety Control System can be monitored using a Standard PLC by allo-
cating the NE1A-series Controller’s status information (general status, local I/
O error status, or other information) or logic operation results in the Standard
PLC for standard I/O communications.
A Safety System and a Monitoring System can be combined and established
on the same network by using standard devices and safety devices.
IMPORTANT A maximum total of 64 standard nodes and safety nodes can be connected on
the same network.
The data attributes handled by standard I/O communications and explicit
message communications are non-safety data. The necessary measures for
safety data are not taken for this data during data generation. Therefore, do
not use this data to configure the Safety Control System.
NE1A
Safety Master
Standard Slave
Safety Slaves by other manufacturers
Safety I/O communications
Standard PLC
Standard Master
Standard I/O communications
and explicit messages
Safety Control SystemMonitoring System
DST1 Safety Slave
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